Method and arrangement for spark telegraphy over high-tension lines or cables



May 22, 1928. 1,670,486

P. TATZ METHOD AND ARRANGEMENT FOR SPARK TELEGRAPHY OVER HIGH TENSION LINES OR CABLES Filed NOV- 6, 1925 INVENTOR PAUL TATZ TORNEY Patented May 22, 1928.

UNITED STATES 1, 10, PATENT OFFICE.

EAUL TKTZ, BERLIN, GERMANY, .ASSIGNOR TO GESELLSGHIAFT FURDRAHTLOSE TELEGRAPHIE M. B. 11., OF BERLILLGERMANY, A CORPORATION OF GERMANY.

mnrnon AND ARRANGEMENT FOR SPARK TELEGRAPHY overtures-mansion Lnuis OR CABLES.

Application filed November 6, 1925, Serial No. 87,202, and in Germany November 8, 1924-.

The object of this invention is to provide means whereby the normal working voltage of a signaling system can be utilized for the artificial production of a secondary wave train series.

Another object is to provide means whereby signals may be sent and received through the medium of a secondarywave train produced by means of a spark gap joined to the transmitting circuit through impedance.

A further object of the invention is to provide a method and means of the character referred to whereby a receiving circuit can be united to the transmitting circuit through high impedance and a spark gap whereby the voltage impulses incideiitly to the im-v pact of transmitted oscillations can be induced into an aperiodic circuit in which an indicating means is inserted by means of which signals can be read.

Other objects of the invention will appear as set forth more fully hereinafter, reference being made to the drawing wherein,

Fi 1 is a diagrammatic plan of a circuit showing the use of high potential condensers joined to a spark gap.

Fig.2 shows an arrangement wherein a receivin circuit is inserted, the receiving circuit ein operated by the oscillations induced in t e spark gap circuit.

Fig. 3 shows another arrangement wherein condensers are replaced by impedance's in the form of wires parallel to and insulated from the aerial wire.

It is well-known that in the case of accidental grounds in high potential lines 0 scillations are propagated from the faulty points in all directions.

In high tension lines it is often noted that sparks frequently pass between individual defective insulating units or elements.

These flashovers constitute slight accidental grounds of the high tension line in view of the capacity of the insulating units. Transmitting waves in this manner are set up on the aerial circuit which inside of a given time interval succeed one another at half the period of the operating frequency. These transmitted waves can be perceived throu 11 indicating devices which are coupled in t e well-known manner to the aeria in conformity with the invention, at th point where signals are to be sent out, a spark would be joined to the line through apparent resistances (impedances), and these impedances preferably could cons st of high potential condensers.

It is obvious that in lieu of the condensers other types of impedances could be employed. The high tension condensers in the case of an aerial could be replaced by aerial w res mounted parallel to the line at a small distance from'said line, the capacity of this wire with reference to the aerial then constituting therequisite impedance. By connecting and disconnecting the sparkgap at any desired rhythm, for instance, at the rhythm of the Morse-code signals, the transmitted waves thus set up produce signals which could be carried over the high tension line to the other end. Also the receiver could be united with the aerial circuit through high impedance. Instead of auditive reception, recourse could also be had to inking reception or to the releasing of any other signals by the use of well-known means for this purpose. Avery simple calling device could be employed inwhich a spark-gap could be used at the receiving end, said spark gap being bridged by means of achoke coil. The latter serves the object of preventing the potential set up by the working voltage from-increasing unduly across the spark-gag in order that the same may not be cause to flash when in idle or inoperative condition. But 'upon the impact of received waves, thepotential set up at the choke coil will be ofsufiicient value to operate the spark-gap. By reason of the sparkgap becoming conductive it'can be made use of in thewell-known manner for calling pur oses and signaling work.

' aving now set forth the objects and nature of my invention what I claim is new and useful and desire to secure by Letters Patent is,-

1. In a si I alling system for spark telegraphy over li igh potential lines and cables, 8. receiving circuit and a transmitting cir cuit coupled thru a high impedance, a spark gap in the transmitting circuit and means controlled b said spark gap whereby the normal wor ing voltage of said high potential line can be utilized for the artificial production of a secondary wave train series or inducing transmitted oscillation into the receiving circuit, whereby signals may be interpreted.

emma 2. In a signalling system for spark telegraphy over hi means using t aerial h potential lines and caloles, e high potential lines as an means controlled b a spark-ga' .for

high excite eonnected t6 the line thru resistances constituting high impedanees for the frequency .of the high potential. said impedances com- 10 prising wires parallel to and insulated from the aerial wire. 

